Migrate Backblaze B2 S3 bucket: Private document library

Summary

Move object storage from Backblaze B2 S3 bucket to Ample, one component at a time. Destination verified on Ample: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok). Source procedure: Inventory the bucket with rclone size or the B2 dashboard. Not migrated automatically: B2 file versions, lifecycle rules and application-key restrictions are not migrated. Cutover: Switch the app's S3_* environment to the Ample bucket with a redeploy, verify reads and writes, keep B2 read-only until confirmed. Rollback: keep the source untouched until you confirm; nothing at the source is changed or deleted by this guide.

Infrastructure requirements

• S3-compatible object storage: verified (Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.)

Prerequisites

• Authorized access to the Backblaze B2 S3 bucket source and its export tooling
• An inventory of every component in scope and out of scope
• A validated backup or copy before any cutover
• An Ample account token with servers:write, buckets:write

Exact tested configuration

• template: node-22
• runtime: node
• size: s-1vcpu-1gb
• install: npm install
• build: npm run build --if-present
• start: npm run start

Steps

1. Inventory the source. List what Backblaze B2 S3 bucket provides beyond the component you are moving. Out of scope here: B2 file versions, lifecycle rules and application-key restrictions are not migrated.
2. Source step 1. Inventory the bucket with rclone size or the B2 dashboard
3. Source step 2. Copy objects with rclone sync from the B2 S3-compatible endpoint to the Ample bucket endpoint using the issued credentials (path-style)
4. Source step 3. Verify a sample of objects by size and checksum after the copy
5. Create the destination bucket and copy. Create the bucket, copy with rclone or the S3 CLI in path-style mode using the issued credentials, then pass the credentials to the app as encrypted S3_* variables.

   ample bucket create --name <bucket-name>

6. Validate before cutover. Run the app's own checks and, for data, compare counts and checksums; the example checks are the pattern self-tests (/p/private-document-library).
7. Cut over. Switch the app's S3_* environment to the Ample bucket with a redeploy, verify reads and writes, keep B2 read-only until confirmed.
8. Rollback. Point DNS or configuration back to the source. The source was never modified; deletion is a separate, user-executed step after validation.

Tested examples

• Express pattern fixture (destination) (tests/deploy-canaries/express-patterns): Verified destination basis: private document library.

Success checks

• destination app responds on its public URL (/ on the live URL, expect ample canary express patterns)
• private-document-library check from the destination example (/p/private-document-library on the live URL, expect see the pattern fixture checks)
• data or object counts and checksums match the source

Limitations

• Documentation only: nothing is executed automatically and no execution binding is offered.
• The source-side procedure is documented from Backblaze B2 S3 bucket's standard tooling and was not executed in this catalog's evidence; the destination side was verified with the pattern fixture.
• No full source-product parity is claimed: B2 file versions, lifecycle rules and application-key restrictions are not migrated.
• Verified on the node-22 template at s-1vcpu-1gb; region, compliance and request-duration limits are unknown.
• PutObject and GetObject with path-style addressing are verified; bulk copy tooling and other S3 operations are not.

Cost estimate

Estimated 5.00 USD per month (size prices from pricing.toml at build revision a1b8c38919e59cd035ebabaced73cf84ece24371).

• app server x1 s-1vcpu-1gb: 5.00 USD

Destination always-on monthly price of the tested sizes; apps auto-pause when idle. Source costs are unknown to Ample.

Verification evidence

• canary_run on 2026-09-21T02:34:39Z at revision 1d28ae0-dirty (CLI 0.1.21): Destination side verified: the Express pattern fixture deployed on Ample (npm install, npm run build --if-present, npm run start on the node-22 template) and its checks passed (a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok)). The source-side export from Backblaze B2 S3 bucket is documented from the vendor's standard tooling and was not executed by this catalog's evidence. (expires 2027-03-20T02:34:39Z)

Execution binding

No execution binding. This recipe is documentation only; nothing is executed automatically.

Next actions

• Browse the catalog index (GET /v1/catalog on the api origin; auth: false, approval: false)
• Search published recipes by intent, stack and constraints (POST /v1/catalog/search on the api origin; auth: false, approval: false)
• Prepare a side-effect-free deployment plan for an authorized project (POST /v1/catalog/plan on the api origin; auth: true, approval: false)