Hi ekazda,
So far, we have released 3 major series of the plugin: 1.x, 2.x, 3.x, 4.x
We learn something new with each major version about our users and the hosting providers out there.
Series 1.x and 2.x were archiving contents using .zip. We found the following problems when using .zip that we consider blockers thus we dropped .zip:
1. .Zip has a limitation of 4GB meaning that if we try to store a file of over 4GB or the archive size is over 4GB, we will not be able to archive the website properly – since we switched to .wpress format, we were able to export websites as big as 17GB.
2. Compressing data takes a lot of processing power – shared hosting providers will kill a process that is using a lot of processing power – we had our plugin removed because of this reason on hosting providers like GoDaddy.
3. Compressing data takes a lot of time – maximum time a script can execute is limited to 30seconds on 85% of all hosting providers. A website with size of 300MB combined with shared hosting provider’s processing speed takes about 2 minutes to process – lots of users ended up with either corrupted archives or no archives.
Our solution, .wpress, is more than 10 times faster when archiving files and folders, the only downsize is that the file produced is bigger compared to .zip.