Umb V10.8.5, uSync v10.7.3 + Vendr.uSync (v2.0.0) Fairly large site with lots of BlockGrid content, gets the following error during a "Clean Export" when the Content section is being traversed on the live server:- Error× Server error: Contact administrator, see log for full details. Server call failed for checking remaining seconds Consequently can't transfer content back to local for development/debugging. Any ideas what might be wrong? Thanks.

Are you sure about those versions? You should have a uSync v13.x version for Umbraco v13

MIxed my projects! It's Umb V10.8.5 with uSync V10.7.3. I'll edit the post. Well spotted!

is there anything in the logs ?

The only thing I can see is : "System.InvalidOperationException: Could not parse 19256aee.c0d415ad.3a6c218c.cf886fdf.a2d4a52c.8d547eba.19246b48.3c9c05df.8b699389.js as a valid smidge path at Smidge.Models.RequestModel..ctor(String valueName, IUrlManager urlManager, IActionContextAccessor accessor, IRequestHelper requestHelper)" But there isn't a Smidge folder on the site.

I think the error in your first post is actually the 'ping' the Umbraco does checking for the serving being up. Maybe it's network related? Can you export them separately (e.g export settings, then content,.then vendor?)

Turned out to be the DB limit on the server. Shared hosting. The site had a lot of pages and they're all blockgrid. Ended up taking a bacpac copy which will do for now.