The primary guide for dual boot can be found here.
Insync handles file deletions a little differently on dual boot. We err on the side of caution to prevent any unwanted data loss on your account. For the use cases below, we include scenarios where a deletion takes place while Insync is primarily online, but highlight the behavior when the app is offline.
Precondition:
OS A: Externally sync a folder to a shared partition/drive
OS B: Externally sync the same folder in OS A to the same shared partition/drive
Case 1: Local to Cloud (L2C) deletion while Insync is offline:
User syncs File A and File B in the folder on OS A
User switches to OS B
File A and B should be completely synced
User deletes File A locally on OS B then quits Insync
User deletes File B locally on OS B while Insync is not running
User restarts Insync on OS B
File B should be unsynced instead of deleted (since changes were made offline)
User switches back to OS A
File A should be deleted, but not File B.
Case 2: Cloud to Local (C2L) deletion while Insync is offline:
User syncs File A and B in the folder on OS A
User switches to OS B
File A and B should be synced on OS B
On the web browser, user deletes File A.
File A should be deleted on OS B.
User quits Insync on OS B and deletes File B via the web browser. File B should also be deleted locally once the user restarts Insync on OS B.
Once the user switches back to OS A, then both File A and B should be deleted.