UpdraftPlus Premium 2.24.3.26

FIX: Regression: Properly mark backups picked up via "Rescan remote storage" as non-native (preventing unwelcome side-effects such as being pruned by another site)
FIX: Correctly update the OneDrive refresh token to prevent expiry
FIX: Again work around an issue with 'SSH2 Server Host Key Algorithm Mismatch' occurring with the current phpseclib release by temporarily reverting to an earlier one as it still does not work on all installs
FIX: When restoring an incremental backup set via WP-CLI, the selected restore point was ignored
FIX: If the remote storage settings were for multiple instances of a single backend-type (e.g. two Dropbox accounts), and if the entire backup and send operation completed in a single PHP process, then the local copy of the files would not be deleted
TWEAK: Show the error message if mbstring.func_overload is turned on in php.ini while creating migration key
TWEAK: Added Azure China endpoint
TWEAK: Resolve "dashicons" CSS conflict
TWEAK: Add 'blogmeta' to the list of core tables (in readiness for WP 5.1)
TWEAK: Remove unnecessary deprecated (in PHP 7.3) parameter to define() in WebDAV HTTP library
TWEAK: Prevent a potential PHP notice in UpdraftPlus Premium when installed without network access
TWEAK: Enhance the updraftplus_exclude_file and updraftplus_exclude_directory filters to also pass the stored names
TWEAK: Add a new constant UPDRAFTPLUS_ZIP_BATCH_CEILING that can tweak internals of the zip backup engine

FIX: Prevent extraction failure when using PclZip (N.B. php-zip is always preferred if installed) on zero-sized files
FIX: Prevent the incremental backup cron from being incorrectly scheduled

FIX: wp_doing_cron() was used when unzipping, but requires WP 4.8+ (regression in 1.16.1, which was never released on wordpress.org)
TWEAK: Updated phpseclib to the latest version after the previous work around to fix the 'SSH2 Server Host Key Algorithm Mismatch' issue
TWEAK: Check-in with the clone during the backup process to make sure it is not prematurely purged