> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gpuhub.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> This document outlines data retention policies, data transfer methods, and public dataset usage for GPUhub instances.

<Warning>
  The instance's system disk and data disk are generally local SSDs, with a small portion being cloud disks.
  Local data disks offer good performance but lack redundant copies. Due to the inherent lifespan of local disks, there is a probability of failure.
  Important data should be regularly backed up to [file storage](/data/file-storage) or local storage.
  GPUhub does not provide reliability guarantees or services for such local storage products.
</Warning>

## Data Retention in Instances

Data retention rules in instances:

1. Data remains intact during normal operation, shutdown, restart, and even after the expiration of annual or monthly subscription plans. However, instances are subject to a release cycle. An instance will be released if it **remains shut down continuously for 15 days**, and **all data within the instance will be cleared**.
2. Additionally, rented hosts have a lease expiration date. The typical lease period for a host ranges from 3 months to several years. **If a host is no longer available for rent, the instance will also be released when the host is taken offline** (the system will display a red countdown notice on the instance at least 7 days in advance, and you can enable instance expiration/release alerts on the console homepage). Therefore, please pay attention to the lease expiration date of the host and it is recommended to subscribe to instance release/expiration notifications on the console homepage.

## Uploading and Downloading Data

Other upload and download methods:

<CardGroup cols={2}>
  <Card horizontal title="Upload Data" icon="cloud-arrow-up" href="/data/upload-data">
    [](/data/upload-data)
  </Card>

  <Card horizontal title="Download Data" icon="cloud-arrow-down" href="/data/download-data">
    [](/data/download-data)
  </Card>
</CardGroup>

## Data Transfer Between Data Centers

There is no dedicated line between our data centers, so transfers between them won't be accelerated.