Delta backup failes if previous transfer isnt done.
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 When a scheduled delta snapshot didnt finish transfer before next instance, it aborts, which means it gets stuck in a never ending loop. 
  
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 XAPI (XenServer/XCP-ng API) can't have tasks longer than 24h (or 48h, depending on the version). So that's sadly… normal. 
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 Oh, not very good. Any way around this? 
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 No XCP-ng/XenServer workaround, it's a "built-in"/by design limitation (it's considered as "stalled"). So your goal would be to avoid these extremely long tasks (ie: to finish before the task is destroyed) 

