Restoration Problems
 

I'm having problems syncing my realm. I had a realm where I made a
significant mistake and so I tried to restore a backup. However, when I
try to sync and use the local version, I get an error saying which crashes
realm works. It says "Sync failed to ImportExportDef record with key "KEY:((A whole lot of hex code))" being 7115456 bytes which is greater than the maximum of 5347737 bytes."

On the flip side When I try to just bring down my data from the server and just deal with the mistake, I get a "sync timed out" error.

Sent a message to support, but any ideas in the interim?

If you search the forums, you will find an ongoing issue with Sync Timeouts... I think you probably have 2 things going on... the first you identified and sent to support and possibly the second which is a known error that is ongoing while the Devs work on it...

I saw that. I ended up working around the issue by loading my backup, going in offline, exporting the entire realm and then importing it into a fresh one.

You can't restore from a backup if you've synced a more recent version with the cloud.
Your local restored copy will always be out-of-date compared to the version stored in the cloud.
Unfortunately, there is no way in the current version of RW to save a "snapshot" of the current realm, in order to be able to go back to it (you can only go back to the last synced version).

Ugh. Well, at least now I'm just dealing with a sync error.