As title states, is there any way to adjust the upload bandwidth cap while backup is in progress?
Sorry, the bandwidth cap can’t be changed during a backup. You can just abort the backup – it should be able to skipped files already uploaded on restart.
What is the best, cleanest way to abort the backup? Ctrl-Z?
Ctrl-c should do it. When you see a ‘incomplete snapshot saved to …’ message it will be able to resume quickly on next run.
I assume you’re asking because you have a large backup to seed, and your ISP (like mine) will punish you for an unthrottled upload during peak hours.
If you’re running on linux, you might want to investigate the possibilities inherent in trickle (for more info see here and here). This should let you define custom upload restrictions.
Disclaimer: I’ve just started looking into this myself, so haven’t fully productionized it yet.
Actually @gchen, if I’m running an upload to b2 with many threads to improve the upload, and then suddenly bandwidth is reduced a lot, is duplicacy going to degrade gracefully?