What is a current size of byteball.sqlite file of a full synced wallet?
My current one is 3,559,501,824 bytes and I'm still syncing. The program shows about 85-90% progress of "new units". However, that may be not accurate since I've restarted the program twice and every time it started from 0. I hope that upon restart it didn't remove previously synced data. So, I suspect the real syncing pgrogress should be at 90-95%. Syncronizing lasts for 5 days.
Is it also possible to copy this database (byteball.sqlite) to another machine, so that machine will not spend days for syncing? If yes, should the other machine have the same wallet(s) to be able to use the database?
Don't have access to the database right now, but the numbers seem coherent. As you said the progress concerns new units, so each time you'll start it, it will start from 0 but that just means it started downloading new units, old units are still there.
Yes you can use the backup option within the wallet and export the backup on another machine (it's supposed to be cross-platform) and yes full wallets backup works with full wallets only and light backup with light wallets only.
