[feature] automatic sync of new snapshots outside of the schedule

[PrivatePuffin]

Describe the feature you'd like to have.
Currently volsync snapshots the PVC and then copies/syncs those snapshots.
It would be great to have a solution to automatically, for example by regex, detect snapshots with a certain naming scheme and copy/sync those.

What is the value to the end user? (why is it a priority?)
This will create improved compatibility with tools/solutions that manage their own snapshots as well snapscheduler

How will we know we have a good solution? (acceptance criteria)

Additional context

[tesshuflower]

Thanks @Ornias1993 for your ER - I think this is something that sounds like a good idea, but not sure we're prepared to make this sort of change at the moment.

There are issues around scheduling, deciding which snapshots to use etc, which to pick and how to know if we've already synced a specific snapshot in the past. It would be easy to sync an older one by accident.

Is your use-case because you're doing some sort of quiescing before taking the snapshots? One thing you could look at is pvc annotations (copy triggers) if you need some more control over when the snapshot occurs. See the docs here: https://volsync.readthedocs.io/en/v0.9.1/usage/pvccopytriggers.html

[PrivatePuffin]

Thanks @Ornias1993 for your ER - I think this is something that sounds like a good idea, but not sure we're prepared to make this sort of change at the moment.

There are issues around scheduling, deciding which snapshots to use etc, which to pick and how to know if we've already synced a specific snapshot in the past. It would be easy to sync an older one by accident.

Is your use-case because you're doing some sort of quiescing before taking the snapshots? One thing you could look at is pvc annotations (copy triggers) if you need some more control over when the snapshot occurs. See the docs here: https://volsync.readthedocs.io/en/v0.9.1/usage/pvccopytriggers.html

Tools that spawn their own PVC/statefullsets and manage their own snapshots of them, such as CNPG, now are completely incompatible with volsync.