What is the suggested way to merge two different storages that are impompatible?

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#1

I am trying to consolidate an old storage a few unique Snapshots from an old HDD into a relatively new storage (on a larger and faster HDD). While the snapshots are different, I expect quite a bit of duplicates and so want to also save space.

I tried COPY operation using Web app - but looks like the two storages are not compatible - I was not expecting them to be different - but looks like they are.

Two questions

  1. What is the suggested way forward here? I am ok with letting go of the old Revs, but I was hoping I can avoid doing a restore the last rev of “each of the snapshots on the old storage” and doing a new backup.

  2. How to identify what difference caused the incompatibility? (Web App)

#2

For the copy operation to work, the second storage must be created as copy compatible to the first storage. There is no way to copy backups between these 2 storages if this option was set when creating the second storage.

#3

Okay.

How to identify what difference is resulting in the incompatibility?

I expected them to be similar. So, just want to see what to pay attention to (besides just using copy compatible flag).

#4

My understanding is that copy operation unpacks, decrypts, repacks, and re-encrypts data. So why are not all storages copy compatible by design? What am I missing?

With bit-identical it’s clear — same encryption keys. What does copy compatible flag actually do?

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#5

I would like to refresh this topic and ask if anything has changed since 2023.
My situation is I have a “backup” between my desktop and laptop by manually copying the same folder between them. So I wanted to consolidate everything using duplicacy.
I initiated a snapshot of my desktop with a storage destination set as my USB drive. Then I initiated a snapshot of my laptop with a storage destination set as a cloud provider.

Is there a method to copy the cloud or USB files to each other without having to restore everything and re-initialise and make new snapshots and start over?

#6

No, there’s not.

But you can get to that point easily:

  1. Initialise a new storage on your USB as a copy of your cloud storage.
  2. ‘Seed’ this new local storage by running a backup from your laptop.
    (This reproduces most of the chunks that already exist in the cloud, locally - you may have to delete the old local backup if you need disk space.)
  3. copy from cloud to new local - this fills in the gaps.
  4. Run backups from your desktop to the new local storage.
  5. copy from local to cloud.

You now have two storages in sync and can copy in whichever direction you want.